The paper aims to identify a reasonable method for mining ultra-thick coal seams in an end-slope in surface mine, With a case study of Heidaigou surface coal mine(HSCM), the paper conducted a comparative research on t...The paper aims to identify a reasonable method for mining ultra-thick coal seams in an end-slope in surface mine, With a case study of Heidaigou surface coal mine(HSCM), the paper conducted a comparative research on three mining methods, namely Underground Mining Method(UMM), Highwall Mining System(HMS) and Local Steep Slope Mining Method(LSSMM). A model was firstly established to simulate the impact that UMM and HMS exert on monitoring points and surface deformation. The way that stripping and excavation amount varies with different slope angle, and the corresponding end slope stability were analyzed in the mode of LSSMM. Then a TOPSIS model was established by taking into account six indicators such as recovery ratio, technical complexity and adaptability, the impact on surface mining production, production safety and economic benefits. Finally, LSSMM was determined as the best mining method for mining ultra-thick coal seams in end slope in HSCM.展开更多
TRD(trench cutting re-mixing deep wall)工法构建的等厚度水泥土搅拌墙具有地层适用性广、墙体均质性好、隔水性能可靠等特点。详细介绍了TRD工法构建的等厚度水泥土搅拌墙围护结构的承载变形特性、设计方法、施工关键技术、检测方法...TRD(trench cutting re-mixing deep wall)工法构建的等厚度水泥土搅拌墙具有地层适用性广、墙体均质性好、隔水性能可靠等特点。详细介绍了TRD工法构建的等厚度水泥土搅拌墙围护结构的承载变形特性、设计方法、施工关键技术、检测方法,以及作为基坑型钢水泥土搅拌墙围护结构和超深隔水帷幕的工程实践。展开更多
选择6种超超临界锅炉受热面管材,利用模拟高温烟气腐蚀试验台研究SO_2体积分数、管壁温度以及不同相态对其腐蚀行为的影响,并在200 k W腐蚀试验台上进行实炉腐蚀试验。结果表明:SO_2体积分数和管壁温度能够显著影响6种受热面管材的腐蚀...选择6种超超临界锅炉受热面管材,利用模拟高温烟气腐蚀试验台研究SO_2体积分数、管壁温度以及不同相态对其腐蚀行为的影响,并在200 k W腐蚀试验台上进行实炉腐蚀试验。结果表明:SO_2体积分数和管壁温度能够显著影响6种受热面管材的腐蚀程度,且气相腐蚀要远远弱于气-固相腐蚀;6种受热面管材的耐腐蚀性能从强至弱依次为HR3C、TP310、国产S30432、S30432、15Cr Mo G、12Cr1Mo VG。在实炉腐蚀试验燃用硫分2.36%煤种时,6种受热面管材的平均年减薄量分别为0.03、0.04、0.14、0.18、0.91、1.04 mm/a,其实际腐蚀情况介于高温烟气腐蚀试验的气-固相腐蚀与气相腐蚀之间。展开更多
基金provided by the National Natural Science Foundation of China(No.90510002)the Science and Technology Research of the Ministry of Education of China(No.306008)
文摘The paper aims to identify a reasonable method for mining ultra-thick coal seams in an end-slope in surface mine, With a case study of Heidaigou surface coal mine(HSCM), the paper conducted a comparative research on three mining methods, namely Underground Mining Method(UMM), Highwall Mining System(HMS) and Local Steep Slope Mining Method(LSSMM). A model was firstly established to simulate the impact that UMM and HMS exert on monitoring points and surface deformation. The way that stripping and excavation amount varies with different slope angle, and the corresponding end slope stability were analyzed in the mode of LSSMM. Then a TOPSIS model was established by taking into account six indicators such as recovery ratio, technical complexity and adaptability, the impact on surface mining production, production safety and economic benefits. Finally, LSSMM was determined as the best mining method for mining ultra-thick coal seams in end slope in HSCM.
文摘TRD(trench cutting re-mixing deep wall)工法构建的等厚度水泥土搅拌墙具有地层适用性广、墙体均质性好、隔水性能可靠等特点。详细介绍了TRD工法构建的等厚度水泥土搅拌墙围护结构的承载变形特性、设计方法、施工关键技术、检测方法,以及作为基坑型钢水泥土搅拌墙围护结构和超深隔水帷幕的工程实践。
文摘选择6种超超临界锅炉受热面管材,利用模拟高温烟气腐蚀试验台研究SO_2体积分数、管壁温度以及不同相态对其腐蚀行为的影响,并在200 k W腐蚀试验台上进行实炉腐蚀试验。结果表明:SO_2体积分数和管壁温度能够显著影响6种受热面管材的腐蚀程度,且气相腐蚀要远远弱于气-固相腐蚀;6种受热面管材的耐腐蚀性能从强至弱依次为HR3C、TP310、国产S30432、S30432、15Cr Mo G、12Cr1Mo VG。在实炉腐蚀试验燃用硫分2.36%煤种时,6种受热面管材的平均年减薄量分别为0.03、0.04、0.14、0.18、0.91、1.04 mm/a,其实际腐蚀情况介于高温烟气腐蚀试验的气-固相腐蚀与气相腐蚀之间。
